Healthy Blueberry Oatmeal Bars

These healthy blueberry oatmeal bars are made vegan and gluten-free for the ultimate breakfast recipe. Imagine blueberries baked on a gluten-free, oatmeal crust with a crumble topping. Each bite is so delicious!

A blueberry crumble bar sits on a plate with lots of blueberries around it.

These blueberry oat bars make my summers better, but they can be enjoyed any time of year. When you’re looking for a healthy, yet satisfying breakfast, these bars really hit the spot. I compare them to these blueberry overnight oats which are also easy to make and pretty tasty, too.

Why This Recipe is a Winner

  • Adding oatmeal to the crust makes this a flavorful gluten-free recipe
  • Blueberries are thickened with a low-carb flakes that are easy to buy online and will help keep this recipe healthy and delicious
  • The crust mix doubles as a crumble topping, sandwiching the rich blueberry sauce with a flavorful, crunchy crust and topping.

What You Need

You can find the full printable recipe, including ingredient quantities, below. But first, here are some explanations of ingredients and steps to help you make this recipe perfect every time.

Here are the ingredients you’ll need for this recipe:

  • Blueberries — You can use fresh or frozen.
  • Agar agar flakes — Did I lose you with the agar flakes? I hope not! Because agar agar flakes are so easy to work with. Imagine it like the gelatin of the sea. You never need gelatin because agar agar flakes work the same way. Buy them at health food stores or online. This 3-pack of agar flakes at Amazon comes at a reasonable price.
  • Lemon juice
  • Agave nectar (or maple syrup) — Keeping these blueberry bars healthy means the recipe calls for minimal sweetener.
  • Rolled oats — Otherwise known as old fashioned oats.
  • Almond meal – I buy almond meal along with my favorite vegan products at Costco.
  • Ground flax
  • Baking powder
  • Sea salt
  • Applesauce 
  • Almond butter — You can substitute peanut butter or cashew butter.
  • Plant-based milk — Use your favorite plant-based milk.
  • Vanilla
  • Apple cider vinegar

How to Make Blueberry Oatmeal Bars

  1. Make the blueberry sauce by cooking the ingredients in a saucepan over medium-high heat
  2. Make the crust by stirring together the dry ingredients, from the oats to the salt.
  3. Stir together the wet ingredients from applesauce to the vanilla.
  4. Make the batter by stirring together the wet and dry mixtures.
  5. Press some of the batter evenly across the bottom of a prepared pan and bake for 15 minutes.
  6. Spread the blueberry filling over the baked crust.
  7. Spoon dollops of the remaining batter equally over the filling.
  8. Bake for 10 minutes, until the top crust turns golden brown. 

Here are more detailed step-by-step instructions:

Step One: Make the Blueberry Sauce

  1. Place fresh or frozen blueberries in a saucepan over medium-high heat. Add the water and agar flakes and stir to combine. Bring this to a boil, then reduce heat to medium and simmer for about 5 minutes, stirring occasionally. Remove from heat.
  2. Stir in the lemon juice and agave, transfer to a bowl, and refrigerate. 
Fresh blueberries sit in the bottom of a pot ready to be placed on the stove.

Step Two: Make the Oatmeal Crust

  1. Stir together the dry ingredients in a bowl. Then scoot them to one side of the bowl.
  2. In the other half of the bowl, stir together the wet ingredients.
  3. Stir the wet and dry ingredients together.
  4. Add a tablespoon or two of water if the mixture is too thick.
Dry ingredients and wet ingredients on separate sides of a white bowl.

As I said, I’m trying to keep these blueberry bars easy! That’s one reason I use only one bowl to make the batter.

Step Three: Assemble and Bake Bars

  1. Spread 3/4 of that oats mixture evenly across the bottom of a prepared pan.
    The batter for this oatmeal bars is pressed into the bottom of a square baking pan.
  2. Place the crust in the oven and bake for 15 minutes.
  3. Spread blueberry filling over the baked crust.
  4. Place dollops of the remaining batter equally over the blueberry filling.
  5. Return to the oven and bake for 10 minutes, until the top crust turns golden brown. 
  6. Set aside to cool and then refrigerate until the filling sets.

Storage Tips

Store in an airtight container in the fridge for up to 7 days. Individual slices can be frozen in a freezer-safe container for up to 2 months.

Healthy Berry Crisp

What makes these berry crumble bars healthy?

  • First of all, they’re free of white, refined sugar. That’s great news because it’s good to keep an eye on that. We’re learning every day about the importance of reducing refined white sugars in our diets.
  • Sugar is minimized. In addition to the type of sweetener used, I also kept it pretty minimal. In fact, if you have a sweet tooth, you may be inclined to increase the sweetness in this recipe just a tad to meet your needs.
  • Healthy fats. There’s no added oils in this recipe. Instead, I’m using almond butter and even the almonds from the almond meal to add healthy fats to this recipe.
  • Nutritious Ingredients. Finally, there are just lots of great healthy ingredients in this blueberry squares recipe, like applesauce and oats that add fiber, nutrients, and the right ingredients to give this crumble texture and flavor!

If you love healthy, berry-infused sweets, check out my Blackberry Banana Chia Pudding! It’s amazing!

How do you make freeze-ahead blueberry crumble bars?

To freeze blueberry crumble bars, make the bars, bake them, and let them cool completely. Freeze the entire batch or individual slices by storing it in a freezer-safe container or freezer bags. They will keep up to 3 months when properly stored in the freezer.

How do you store blueberry crumble?

Any leftover blueberry crumble slices can be stored in an airtight container or wrapped in foil. It will keep 3 to 4 days at room temperature or up to 8 days in the fridge.

A baking dish full of blueberry crumble bars sits next to a bowl of fresh blueberries.

More Blueberry Favorites

It’s true these healthy blueberry oatmeal bars are the best! Now, here’s even more vegan blueberry recipes you’ll love!

A slice of oatmeal blueberry bars sits in the foreground with another slice behind it.
A blueberry oatmeal bar sits on a white plate with lots of blueberries around it.

Healthy Blueberry Oatmeal Bars

Make breakfast special and still healthy with these healthy blueberry oatmeal bars. You'll love the blueberries sandwiched between an oatmeal crust and a crispy crumble topping.
5 from 2 votes
Course: Breakfast
Cuisine: American
Prep Time: 10 minutes
Cook Time: 25 minutes
1 hour
Total Time: 35 minutes
Servings: 9
Calories: 324kcal
Author: Marly

Ingredients

Blueberry Filling

  • 3 cup blueberries , fresh or frozen
  • ½ cup water
  • 1 tablespoon agar agar flakes
  • 1 teaspoon lemon juice
  • ¼ cup agave nectar (or maple syrup/honey)

Oatmeal Crumble

  • 1 ½ cups rolled oats
  • 2 cups almond meal
  • 1 tablespoon ground flax meal
  • ½ teaspoon baking powder
  • ¼ teaspoon sea salt
  • ½ cup applesauce , unsweetened
  • cup agave nectar (or maple syrup/honey)
  • ¼ cup almond butter
  • ½ cup plant-based milk
  • teaspoon vanilla
  • 1 teaspoon apple cider vinegar

Instructions

  • Heat your oven to 350°F. Spray a 9X9 inch square baking dish with vegetable cooking spray.
  • Place blueberries in a saucepan. Add the water and agar flakes to the blueberry mixture and stir to combine. Bring this to a boil over medium-high heat. Once it begins to boil, reduce heat to medium and simmer for about 5 minutes, stirring occasionally. Remove from heat.
  • Pour the lemon juice and agave in the blueberries. Stir to combine. Transfer to a bowl and refrigerate. 
  • Combine the oats, almond meal, flax meal, baking powder, and sea salt in a bowl. Stir to combine. Scoot the ingredients to one side of the bowl. In the other half of the bowl, combine the applesauce, agave nectar, almond butter, milk, vanilla, and vinegar. Stir to combine. Then stir the wet and dry ingredients together. Add a tablespoon or two of water if necessary.
  • Take 3/4 of that oats mixture and press evenly across the bottom of your prepared pan. Set the rest of the batter aside.
  • Place the crust in the oven and bake for 15 minutes.
  • Remove crust from the oven. Check the blueberry filling. It should have thickened by now. Spread it over the baked crust.
  • Place dollops of the remaining crust batter distributed equally over the blueberry filling. Return to the oven and bake for 10 minutes, until the top crust turns golden brown. 
  • Remove from oven and set aside to cool before refrigerating to allow the filling to set completely.

Recommended Equipment

(The products above contain sponsored links to products we use and recommend)

Notes

You can substitute 1 tablespoon cornstarch for agar flakes.
Nutrition Facts
Healthy Blueberry Oatmeal Bars
Amount Per Serving
Calories 324 Calories from Fat 153
% Daily Value*
Fat 17g26%
Saturated Fat 1g5%
Sodium 75mg3%
Potassium 202mg6%
Carbohydrates 36g12%
Fiber 6g24%
Sugar 17g19%
Protein 9g18%
Vitamin A 80IU2%
Vitamin C 6.1mg7%
Calcium 120mg12%
Iron 2.2mg12%
* Percent Daily Values are based on a 2000 calorie diet.

The nutrition information shown is an estimate provided by an online nutrition calculator and should not be considered a substitute for a professional nutritionist’s advice.

This post was originally published in 2018 and was updated to include new photos, new text, and an updated recipe in 2021.

4 Responses to Healthy Blueberry Oatmeal Bars

  1. Avatar thumbnail image for MarlyLeona Reply

    I love blueberries. I’m going to make these crumble bars.

    • Avatar thumbnail image for MarlyMarly

      Thanks! So glad you like these blueberry gars!

  2. Avatar thumbnail image for MarlyEmjay Reply

    You have apple cider vinegar listed in the ingredients but it’s not mentioned in the instructions. Does it go in the crust batter or in with the blueberries?

    • Avatar thumbnail image for MarlyMarly

      Hi Emjay! Thanks for your comment. The vinegar should have been included in the instructions. It’s fixed now. Thanks for letting me know about that!

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